package Dist::Zilla::Plugin::ShareDir::Tarball;
BEGIN {
  $Dist::Zilla::Plugin::ShareDir::Tarball::AUTHORITY = 'cpan:YANICK';
}
# ABSTRACT: Bundle your shared dir into a tarball
$Dist::Zilla::Plugin::ShareDir::Tarball::VERSION = '0.5.0';

use strict;
use warnings;

use Moose;

use Dist::Zilla::File::InMemory;
use Compress::Zlib;
use Archive::Tar;

has dir => (
  is   => 'ro',
  isa  => 'Str',
  default => 'share',
);

has archive => (
    is => 'ro',
    lazy => 1,
    predicate => 'has_archive',
    default => sub {
        Archive::Tar->new;
    },
);

has share_dir_map => (
    is => 'ro',
    lazy => 1,
    default => sub {
        my $self = shift;

        return $self->has_archive ? { dist => $self->dir } : {};
    },
);

has archive_dz_file => (
    is => 'ro',
    lazy => 1,
    default => sub {
        Dist::Zilla::File::InMemory->new(
            content => 'placeholder',
            encoding => 'bytes',
            name    => join '/', $_[0]->dir, 'shared-files.tar.gz',
        );
    },
);

sub compressed_archive { 
    Compress::Zlib::memGzip($_[0]->archive->write) 
}

sub find_files {
  my $self = shift;

  my $dir = $self->dir . '/';
  return grep { $_->name ne $self->archive_dz_file->name }
         grep { !index $_->name, $dir }
              @{ $self->zilla->files };
}

sub gather_files {
    my $self = shift;
    
    $self->add_file( $self->archive_dz_file );
}


sub prune_files {
    my $self = shift;

    my $src = $self->dir;

    for ( $self->find_files ) {
        ( my $archive_name = $_->name ) =~ s#$src/##;
        $self->archive->add_data( $archive_name => $_->content );
        $self->zilla->prune_file($_);
    }

}

sub munge_files {
    my $self = shift;

    $self->archive_dz_file->content( $self->compressed_archive );
}


with 'Dist::Zilla::Role::ShareDir',
     'Dist::Zilla::Role::FileInjector',
     'Dist::Zilla::Role::FileGatherer',
     'Dist::Zilla::Role::FileMunger',
     'Dist::Zilla::Role::FilePruner';

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

Dist::Zilla::Plugin::ShareDir::Tarball - Bundle your shared dir into a tarball

=head1 VERSION

version 0.5.0

=head1 SYNOPSIS

    # in dist.ini

    [ShareDir::Tarball]

=head1 DESCRIPTION

Using L<File::ShareDir> to deploy non-Perl files alongside a distribution is
great, but it has a problem.  Just like for modules, upon installation CPAN clients
don't remove any of the files that were already present in the I</lib>
directories beforehand. So if version 1.0 of the distribution was sharing

    share/foo
    share/bar

and version 1.1 changed that to 

    share/foo
    share/baz

then a user installing first version 1.0 then 1.1 will end up with 

    share/foo
    share/bar
    share/baz

which might be a problem (or not).

Fortunately, there is a sneaky
workaround in the case where you don't want the files of past distributions to
linger around. The trick is simple: bundle all the files to be shared into
a tarball called I<shared-files.tar.gz>.  As there is only that one file, any
new install is conveniently clobbering the old version. 

But archiving the content of the I<share> directory is no fun. Hence
L<Dist::Zilla::Plugin::ShareDir::Tarball> which, upon the file munging stage, gathers all 
files in the I<share> directory and build the I<shared-files.tar.gz> archive
with them.  If there is no such files, the process is simply skipped.

=head1 OPTIONS

=head2 dir

The source directory to be bundled into the shared tarball. Defaults to
C<share>.

=head1 SEE ALSO

L<Dist::Zilla::Plugin::ShareDir>, which is similar to this module, but without
the conversion of the shared directory into a tarball.

L<File::ShareDir::Tarball> - transparently extract the tarball behind the
scene so that the shared directory can be accessed just like it is in
L<File::ShareDir>.

L<Module::Build::CleanInstall> - A subclass of L<Module::Build> which
deinstall the files from previous installations via their I<packlist>.

=head1 AUTHOR

Yanick Champoux <yanick@cpan.org>

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2012 by Yanick Champoux.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut